Gun-mounting.



PATENTBD JAN. 6v, 1903.

loperates with taper passages' on the hollow UNrTED STATES ARTHURTREVOR` DAWSON AND GEORGE THOMAS BUCKHAM, WEST- MINSTER, LONDON,ENGLAND, ASSIGNORS TO VIOKERS SONS & MAXIM,

LIMITED, VOF LONDON, ENGLAND.

GUN-MOUNTING.

Sl?llG.`[I:`JGA'.'DIO N` forming part of Letters I atent No. I718,050,dated January 6, 1903.

Original application filed DecemberlljlQOl. Serial No. 85,296.

No.12'h591.

To all whom it may concern:

Be it known that we,ARTHUR TREvoR DAW- SON, lieutenant of Royal Navy,and GEORGE THOMAS BUCKHAM, engineer, both residing at 32 Victoriastreet,Westminster, in the count-y of London, England, subjects of theKing of Great Britain, have invented certain new and useful Improvementsin and Relating to Gun- Mountings, of which the following'is a, specication.

This inventionrelates to quick-firing and other gun mountings that areprovided 'with a hydraulic buler for absorbing the energy of recoil anda recuperator for running the gun forward to firing position afterrecoil. The chief object of our invention is to provide means forcontrolling the velocity with which the gun runs forward after recoil,said invention being applicable to that form of' recoil-buer in whichthe cylinder has a hollow piston-rod and a retarding-ram extend-1 inginwardly from one end of the cylinder into the said hollow piston-rod.The piston is partly 4withdrawn from the ram during re' coil, therebyleaving in' the piston-rod a space which becomes filled with liquid thatmust be displaced by the ram w-hile'the gun is being run forward afterrecoil, provision being made for the displaced liquid to be forcedthrough a restricted passage, thus controlling the velocity with whichthe gun is returned to lits firing position. In the specificationofanother application for patent, Serial No. 85,296, of 1901, we havedescribed for accomplishingv this purpose means whereby the liquid inthe hollow -piston-rod can only escape baclto the recoil-cylinderthrough an opening or'passage which gradually diminishes in area duringthe forward movement of the piston as the gunregains its firingposition. According to our present invention we for this purpose provideIthe inner end of the aforesaid'ram with a valve arrangement whichcopiston-rod, as hereinafter explained.

In the accompanying drawings, Figure l is a longitudinal section of arecoil-cylinder pro- Aendof said cap c3. q hole c5, Within a. space c7provided for its re- `videdwith our improvements. Figs. 2 and Dividedandthis application liled October 16, 1902. Serial l (No model.)

spectively, on the lines l 1 and 2 2.

A is therecoil-cylinder; B, the hollow pis-v` 3 are transverse sectionsthereof, taken, re-

ton-rod; B', itspiston C, the ram, which pro- A jects from one end ofthe cylinder and enters the hollow piston-rod.4v

A is the key within the cylinder A,- and B2 the aperture in said piston,that 4acts in conjunction withsaid key for increasing the resistance tothe recoil as'said pistontravels in the cylinder during the recoilmovement ofthe gun. A

C is the lng or bracket on the gun, to which the piston-rod is secured.

b b are inclined passages thehollowpiston-rod and serving to connect theannular space existing between the ram C and the hollow pistonrodwiththe space a in the cylinder A behind the piston.

Along the interior surface .of the hollow formed through piston-'rod areformed one or more longitudil nal taper grooves 66, which open at theirends of greater area into the passage or passages I b, through whichcommunication is established between the space a of the recoil-cylinderand the interior of the hollow piston- A rod.- The said taper groovesextend rearwardly and gradually diminish in area until 4they merge intothe cylindrical inner surface of the hollow pistonrod at about the pointla7.

b5 is a vnon-return valve at the inner or rear end o2 of the ram, atwhich end said ram isfurnished with a cap c3, whose outer' diameter tsthe interior of the hollow piston-rod B and is formed with alongitudinal groove or passage c4. The end c2 of the ram is also formedwith a central hole c5, which extends forwardly and diverges at c to thecircumference ata point in advance of the forward At the mouth of thesaid ception, is located the non-return valve b5.

The end of the said cap'c3 is perforated at o8 cs to permit of liquidreaching the said space c7 from the interior of the hollow piston-rod.During recoil of the gun the pressurein the.

space ct ofthe cylinder Aforces the liquid 95k through the passageb inthe piston-rod Binto the annular space around the ram C, thence throughthe holes c6 c5 in said ram, past the valve b5, and through theperforations c6 in the 'cap c3, whereby said liquid reaches the spacewithin the hollow piston-rod and keeps it filled with liquid as the rodis withdrawn from the rain C. O n the completion of the recoil and inthe return movement of the gun the aforesaid valve b5, under thepressure of the liquid within the hollow piston-rod, closes the passagec5. Consequently the only way of escape left for the liquid from saidhollow piston-rod is by the small groove c4 in the cap c3 and the tapergrooves b in the pistonrod, leading to the passages b. Asthese groovesbe gradually diminish in area, it follows that during the returnmovement of the piston and its rod the gun will be very graduallybrought to rest as it terminates its forward movement.

What we claim, and desire to secure by Letters Patent of the UnitedStates, is-

In recoil apparatus for guns, the combination with the ram and thehollow pistou-rod 'having passages therein capable of communicating withthe interior and exterior of the said hollow piston-rod, of a non-returnvalve located near the inner or rearward end of the ram and of aperforated cap having a chamber inclosing said non-return valve andcommunicating with a passage in the ram leading to-opposite ends of saidperforated cap; said cap being of a diameter to t the hollow piston-rodand formed in its periphery with a longitudinal' passage adapted tocoperate with a tapered passage in the interior of the hollowpiston-rod, substantially as and for the purpose specified.

In testimony whereof we have hereunto set our hands, in presence of twosubscribing witnesses, this 6th day of October, 1902.

ARTHUR TREVOR DAWSON. GEORGE THOMAS BUCKHAM. Witnesses:

HENRY KING, PHILIP MANN.

